rocks?

I was wonder if anyone has any tips for modelling rocks or a floating island type shape - iregular shape I guess -

http://www.atypicalweb.com/mt-images/gorillaz3.jpg

http://www1.istockphoto.com/file_thumbview_approve/595027/2/istockphoto_595027_autumn_overhang.jpg

Thanks again
Adam

What about using noise and a checkered pattern on a grid to make the raised hilly effect - not sure if that’s clear what I mean - I’ll do a quick demo in a bit…

You can use a mix of proportional editing (activate it by hotkey O), and a displacement texture (in the material panels)

In the newer CVS builds you have an even better option which is the new sculpt mode